What the Discount Calculator does
This tool turns a percent-off deal into real numbers, live as you type. Enter the original price and a discount percentage, and it instantly shows the final price with the old price struck through, a You save figure, and the effective percent off. You can stack several discounts that apply one after another, and switch on tax to add it after the discount. It is handy for shoppers checking a “25% off” sticker, sellers setting markdown prices, and anyone comparing a “20% then an extra 10%” coupon deal before paying. No mental math, no second-guessing.
How to use it
- In the Original price field, enter the full price of the item (for example, 100).
- In the first Discount % row, enter the percentage off. The % sign is already shown, so just type the number (for example, 20).
- To stack another discount, click Add another discount and enter a second percentage. Each discount applies to the already-discounted price, not the original, so they build on one another.
- Optionally switch on Add tax after discount and enter a Tax %. The tax is applied to the discounted price.
- Read the results instantly. There is no button to press: the Final price shows with a was strike-through of the original, along with You save and the effective percent off. Cards below break down the price after discount, the effective discount when you stack more than one, and the tax amount.
Why use it here
It is free, needs no sign-up, and updates the moment you type. Everything runs locally in your browser, so the prices you enter never get uploaded anywhere and stay on your device. That also means it works offline once the page has loaded, and feels instant on a phone in a store aisle.
A quick tip about stacked discounts
Stacked discounts do not simply add up. A “20% off, then an extra 10%” deal is not 30% off, because the 10% comes off the already-reduced price, so the effective discount is 28%. The tool spells out that effective rate for you whenever you combine more than one discount, which makes it easy to compare a single big discount against a chain of smaller ones. Keep in mind results are a straightforward math estimate and are currency-agnostic, so type plain numbers and read the totals in whatever currency you are shopping in.
Frequently asked questions
- How do I calculate the sale price after a percentage discount?
- Enter the original price, then set the discount percentage. The final price, the amount you save, and the effective discount update live as you type, so there is no button to press.
- Why isn't 20% then 10% the same as 30% off?
- Stacked discounts apply one after another, not all at once. A 10% cut comes off the already-reduced price, not the original, so 20% then 10% works out to 28% off, not 30%. The tool shows this effective rate whenever you stack more than one discount.
- Can I add sales tax on top of the discount?
- Yes. Switch on 'Add tax after discount' and enter the tax percentage. The tax is applied to the discounted price, and its amount appears as its own card so you can see the final total including tax.
- Does the discount calculator show how much money I save?
- Yes. Along with the final price, it displays a 'You save' figure and the effective percent off, so you can see the savings in money, not just as a percentage.
- Is the discount calculator free and private?
- Yes, it is free with no sign-up. All math happens locally in your browser, so the prices you type are never sent to a server.
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Last updated: June 15, 2026